disable player fall damage.

leaves now preserve their level when they start decomposing.

mods/bg_player/misc.lua

@@ -5,5 +5,8 @@ blockgame.register_on_joinplayer(function(player)
 		data.properties.pointable = false
 		data.properties.zoom_fov = 15
 		data.properties.eye_height = 1.7
+		player:set_armor_groups({
+			fall_damage_add_percent = -100,
+		})
 	end)
 end)

mods/bg_tree/decompose.lua

@@ -44,7 +44,12 @@ local start_decompose_cost = 4000
 blockgame.register_increasing_abm({
 	id = modname .. ":begin_decompose",
 	label = "decompose leaves",
-	nodenames = {leaves},
+	nodenames = {
+		leaves .. "_1",
+		leaves .. "_2",
+		leaves .. "_3",
+		leaves .. "_4",
+	},
 	neighbors = {"group:dirty", leaves_decomposing},
 	interval = 15,
 	chance = 8,
@@ -59,9 +64,8 @@ blockgame.register_increasing_abm({
 		return data.value >= start_decompose_cost
 	end,
 	action = function (pos, node, data)
-		-- NOTE: might wanna access the 4 from somewhere, instead of directly knowing it.
-		-- that way this won't have to change if decomposing leaves max levels change.
-		local level = math.random(1, 4)
+		local def = minetest.registered_nodes[node.name]
+		local level = def.level
 		minetest.set_node(pos, {name = leaves_decomposing .. "_" .. level})
 	end,
 })

mods/bg_tree/fall_leaves.lua

@@ -1,5 +1,7 @@
 local modname = minetest.get_current_modname()
 
+local level_max = minetest.registered_items[modname .. ":leaves"].level_max
+
 blockgame.register_abm({
 	label = "make unsupported leaves fall",
 	nodenames = {
@@ -25,8 +27,8 @@ blockgame.register_abm({
 		end, 3)
 
 		if not is_supported then
-			-- TODO: become randomly-sized leaves pile when layered leaves is added.
-			minetest.set_node(pos, {name = modname .. ":leaves"})
+			local level = math.random(1, level_max)
+			minetest.set_node(pos, {name = modname .. ":leaves_" .. level})
 			minetest.check_for_falling(pos)
 			-- TODO: send out event here that makes nearby leaves check if they're unsupported as well?
 		end

mods/bg_tree/node_leaves.lua

@@ -1,5 +1,7 @@
 local modname = minetest.get_current_modname()
 
+local leaves_level_max = 4
+
 local base_def = {
 	drawtype = "allfaces_optional",
 	paramtype = "light",
@@ -9,6 +11,7 @@ local base_def = {
 		extends_leaves_support = 1,
 		air_flowable = 1,
 		falling_node = 1,
+		leafy = 1,
 	},
 }
 
@@ -43,11 +46,17 @@ local nutty_drops = {
 	},
 }
 
-reg_leaves("leaves", {
+blockgame.register_leveled_node(modname .. ":leaves", blockgame.underride({
 	description = "Leaves",
+	level_max = leaves_level_max,
+	tiles = {
+		modname .. "_leaves.png",
+	},
 	walkable = false,
 	supports_falling = true,
-})
+	level_max = leaves_level_max,
+}, base_def))
+
 reg_leaves("leaves_growing", {
 	description = "Growing Leaves",
 	texture = "leaves_alive",
@@ -64,82 +73,16 @@ reg_leaves("leaves_alive", {
 	},
 })
 
---[[
-local function check_decompose (pos)
-	local node = minetest.get_node(pos)
-	return blockgame.item_matches(node.name, {"group:leaves_decomposing"})
-end
-]]--
-
--- TODO: generalize stacking node registration and put into API.
-local decomposing_leaves_layers = 4
-
---[[
-local function after_place_stack (pos)
-	if not check_decompose(pos) then return end
-
-	local below = pos + blockgame.vector.dirs.down
-	if check_decompose(below) then
-		local node = minetest.get_node(pos)
-		local below_node = minetest.get_node(below)
-
-		local def = minetest.registered_nodes[node.name]
-		local below_def = minetest.registered_nodes[below_node.name]
-
-		if below_def.level ~= decomposing_leaves_layers then
-			local max_diff = decomposing_leaves_layers - below_def.level
-			local diff = math.min(max_diff, def.level)
-
-			minetest.swap_node(below, {name = modname .. ":leaves_decomposing_" .. (below_def.level + diff)})
-			if diff == def.level then
-				minetest.remove_node(pos)
-			else
-				minetest.swap_node(pos, {name = modname .. ":leaves_decomposing_" .. (def.level - diff)})
-			end
-		end
-	end
-
-	local above = pos:offset(0, 1, 0)
-	if check_decompose(above) then
-		after_place_stack(above)
-	end
-end
-
-local function reg_decomposing (level)
-	local height = level / decomposing_leaves_layers
-
-	local description = "Decomposing Leaves (" .. level .. "/" .. decomposing_leaves_layers .. ")"
-	if level == decomposing_leaves_layers then description = "Decomposing Leaves" end
-
-	local drawtype = "nodebox"
-	local node_box = {
-		["type"] = "fixed",
-		fixed = { -0.5, -0.5, -0.5, 0.5, -0.5 + height, 0.5 },
-	}
-	if level == decomposing_leaves_layers then
-		drawtype = "allfaces_optional"
-		node_box = nil
-	end
-
-	reg_leaves("leaves_decomposing_" .. level, )
-end
-for level=1, decomposing_leaves_layers do
-	reg_decomposing(level)
-end
-
-minetest.register_alias(modname .. ":leaves_decomposing", modname .. ":leaves_decomposing_" .. decomposing_leaves_layers)
-]]--
-
 blockgame.register_leveled_node("leaves_decomposing", blockgame.underride({
 	description = "Decomposing Leaves",
-	level_max = decomposing_leaves_layers,
+	level_max = leaves_level_max,
 	tiles = {
 		modname .. "_leaves_decomposing.png",
 	},
 	groups = {
-		leaves_decomposing = decomposing_leaves_layers,
+		leaves_decomposing = leaves_level_max,
 	},
 	walkable = false,
 	supports_falling = true,
-	level_max = decomposing_leaves_layers,
+	level_max = leaves_level_max,
 }, base_def))